This is a task for a release of GHC beyond 8.2.2. Here's what's going on:

• There is a bug with ghc-pkg, see Shadowed dependencies during builds with Cabal 2.0 WAS: cabal 2.0 and alex on macos haskell/cabal#4728

• There is a patch on phabricator that will hopefully land after 8.2.2: https://phabricator.haskell.org/D4159

• Reconfigure is currently forced when deps are rebuilt - Force reconfigure when deps are rebuilt #2781 #3503

So, this issue is tracking disabling the reconfigure workaround when upstream is fixed, as this will make builds faster.